[GRASSLIST:2689] stitching geotiffs

[Martin du Saire]

Hi,

I am a newbie to GRASS (XT, Cygwin/XFree86; GRASS5.0) and GIS trying to 
stitch together a set of NLCD Geo-Tiff  (USGS Landsat-5, etc.) data files 
for a set of contiguous states in the US.  I finally figured out how to 
import them using r.in.gdal -o.  (If there is some inherent problem with 
overriding the projection checking, please let me know.)

For starters, how do I go about importing the individual files with their 
corresponding UTM zone designations into the same project?

Assuming I can figure that out, do I use r.mask to remove the background 
from each of these maps?

Thanks for your help.

Martin
mdusaire at umn.edu